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Simplifying a + (a + 1) + (a + 2) + (a + 3) + (a + 4) = 90 Reorder the terms: a + (1 + a) + (a + 2) + (a + 3) + (a + 4) = 90 Remove parenthesis around (1 + a) a + 1 + a + (a + 2) + (a + 3) + (a + 4) = 90 Reorder the terms: a + 1 + a + (2 + a) + (a + 3) + (a + 4) = 90 Remove parenthesis around (2 + a) a + 1 + a + 2 + a + (a + 3) + (a + 4) = 90 Reorder the terms: a + 1 + a + 2 + a + (3 + a) + (a + 4) = 90 Remove parenthesis around (3 + a) a + 1 + a + 2 + a + 3 + a + (a + 4) = 90 Reorder the terms: a + 1 + a + 2 + a + 3 + a + (4 + a) = 90 Remove parenthesis around (4 + a) a + 1 + a + 2 + a + 3 + a + 4 + a = 90 Reorder the terms: 1 + 2 + 3 + 4 + a + a + a + a + a = 90 Combine like terms: 1 + 2 = 3 3 + 3 + 4 + a + a + a + a + a = 90 Combine like terms: 3 + 3 = 6 6 + 4 + a + a + a + a + a = 90 Combine like terms: 6 + 4 = 10 10 + a + a + a + a + a = 90 Combine like terms: a + a = 2a 10 + 2a + a + a + a = 90 Combine like terms: 2a + a = 3a 10 + 3a + a + a = 90 Combine like terms: 3a + a = 4a 10 + 4a + a = 90 Combine like terms: 4a + a = 5a 10 + 5a = 90 Solving 10 + 5a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 5a = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 5a = 90 + -10 5a = 90 + -10 Combine like terms: 90 + -10 = 80 5a = 80 Divide each side by '5'. a = 16 Simplifying a = 16
| 4n+n=90 | | 100-140= | | 15+6=921 | | 5/4(x+8)=12 | | 2x^2-3x^2=0 | | -100-140= | | (6.1x10^11)/(1.9x10^14) | | 447=-8-7(n-1) | | -s^2+12s=0 | | 21+x=4x | | 12+9=321 | | -24x+40=6x+30 | | 4x-4y=36 | | 3-6(x-3)=4x+3(x-8) | | x/2+8+16 | | -4y=-64-6x | | y=.06x-4500 | | 9-12=12x+5-8x | | x-6y=4 | | 7d-4d-d-7-5d=0 | | x-1.1y=10 | | [2x-4]=16 | | 3x^3+4x^2+10=0 | | 3.4q-1.4-4.9q=-2.5q-4.4 | | -2+17=3 | | 447=-3(n-1) | | 3y/5+3/2=7y/10 | | -2(y+1)=1(y^2-9) | | 3-5+=2y-4 | | 3-5+y=2-4 | | 5y+6y+17=-16 | | -1+8(8-x)=4-(4-x) |